Marin Four Corners Black - 2020

Size Chart
Size Chart - Marin Four Corners 2020


A. STACK (MM) 560 580 617 646.3 677.6
B. REACH (MM) 376.7 381 403.3 412.6 426.6
C. HEADTUBE ANGLE 70.5 70.5 71.5 71.5 71.5
D. HEADTUBE LENGTH (MM) 177 198 198 229 262
E. SEATTUBE ANGLE EFFECTIVE 74.5 73.5 73.5 72.5 72
F. SEATTUBE LENGTH 381 422 462 495 528
G. TOPTUBE EFFECTIVE (MM) 532 552.8 586.1 616.4 646.8
H. BOTTOM BRACKET HEIGHT (MM) 285 285 285 285 285
I. BOTTOM BRACKET DROP (MM) 53.5 53.5 72 72 72
J. CHAINSTAY (MM) 432 432 450 450 450
K. WHEELBASE (MM) 1030.4 1041.8 1081 1100 1125.1
L. STANDOVER HEIGHT (MM) 666.55 706.38 744.53 777.26 809.8
M. FORK OFFSET (MM) 43 43 49 49 49
SEATPOST DIAMETER 27.2 27.2 27.2 27.2 27.2
HANDLEBAR WIDTH 400 400 420 440 440
STEM LENGTH 70 70 70 70 70
CRANK LENGTH 170 170 170 175 175


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The Four Corners series is perfectly suited to today’s commute and tomorrow’s touring adventures. The butted 4130 CrMo steel frame and fork are designed to handle fully loaded touring, with up to six bottle mounts, rack and fender eyelets, lowrider fork mounts, generous tire clearance and disc brakes to bring it all to a stop. Marin updated the geometry based on biometric fit data, and for 2019 offers five different frame sizes with size proportionate 650B or 700C wheels to properly fit riders between 4’11” – 6’4”. The bars are set high for all-day comfort and heads-up visibility in traffic, with mountain steering geometry capable of taking you down whatever path your destination requires. Carry a laptop and change of clothes during the week, a tent and camp stove come Saturday morning. Get to work, and get out of town.


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The Four Corners is available in five frame sizes to fit riders 4’11 to 6’4” without compromise. For proper fit and bike handling sizes XS and S use 650B wheels, sizes M, L, and XL use 700C.


New for 2019 are fork leg bottle or accessory cage mounts, along with traditional front triangle bottle mounts (three on sizes M-XL, two on XS-S) for up to six bottle cage mounts total.


The Four Corners has separate fender and rack mounts on both the frame and fork to fit a variety of aftermarket accessories securely and without interference with one another.


The Four Corners uses a double butted and formed 4130 CrMo frame specially tuned for loaded touring with upright geometry for comfortable and efficient all-day rides.


Disc brakes provide smooth, controlled stopping in all conditions with minimal maintenance.


Frame Utilitour Double Butted CrMo, Size-Specific Wheels (XS, S = 650B, M, L, XL = 700C) , Biometric Geometry, Fender and Rack Mounts, Disc Mount
Fork CrMo, Fender, Rack, and Bottle Cage Eyelets, IS Disc Mount
Rim Marin Aluminum, Double Wall, Disc Specific
Hub Rear Forged Aluminum Alloy, 6-Bolt Disc, 32H
Hub Front Forged Aluminum Alloy, 6-Bolt Disc, 32H
Spokes 14g Black Stainless Steel
Tires WTB Resolute, 650B/700Cx42, Puncture Protection
Derailleur Rear Shimano Sora 9-Speed
Derailleur Front Shimano Sora
Shift Lever Shimano Sora 3x9-Speed
Crankset Shimano Sora Hollowtech II, 50/39/30T
Bottom Bracket Shimano Hollowtech II
Chain KMC X9
Cassette Shimano HG300 9-Speed, 11-34T
Brakes Front Tektro Spyre-C Road Mechanical Disc, 160mm Rotor
Brakes Rear Tektro Spyre-C Road Mechanical Disc, 160mm Rotor
Brake Levers Shimano w/ Integrated Shifters
Handlebar Marin Butted Alloy, Compact 12º Flared Drop
Stem Marin 3D Forged Alloy
Grips Marin Comfort Bar Tape, Shock Absorbing Gel Pads
Headset FSA No.8D, Sealed Cartridge Bearings
Seatpost Marin Alloy, 27.2mm
Saddle WTB Volt Sport 142 Custom
Pedals -


Looking for the perfect size? Checkout our handy quick reference chart below (NOTE: The chart assumes average limb and torso proportions).
Not sure about your size? Just send us your measurements using our Bike Sizing form and one of our experts will help you out!

XS 4'11" to 5'2"
S 5'2" to 5'6"
M 5'6" to 5'10"
L 5'10" to 6'1"
XL 6'1" to 6'4"


"If you’re a commuter or utility rider who wants to do some touring on the weekends, the Four Corners is solid candidate. With a change of tires it’s also a capable dirt-road explorer. A few short years ago a bike of this caliber this would have sold for much more. But despite its base-level designation, the Four Corners performs well above its price point. It’s so capable, in fact, that I often found myself inadvertently comparing it to bikes retailing for $500-$1000 more. Sure, those more expensive bikes might be a little lighter, and come spec’d with fancier components, but the Four Corners gives up nothing when it comes to function and versatility."
 Gravel Bike   |   See the full review

"If you appreciate an upright, comfort-oriented geometry, plus the ability to run big tires, the 2018 Marin Four Corners certainly looks like a good value."   |   See the full review

"The mark of a good adventure bike is how easily it can go from dirt roads and gravel paths to the city streets of a daily commute. Marin's Four Corners bike is optimized for comfortable multi-terrain touring, with a long, tall frame that steers slowly and has extra braze-ons for storing cargo without sacrificing balance and speed."
 Fast Company   |   See the full review

"Four Corners is a recommendable, very attractive price and universal expedition bike."
— Bike World   |   See the full review

"The Four Corners is a comfy, fun bike to ride over all terrains, equally at home loaded up with touring/bikepacking bags as it is at home on the daily commute."
 Pannier   |   See the full review

"The Four Corners is a bikepackers dream"

— Bicycling Mag   |   See the full review

"We’ve really enjoyed our time with the Four Corners, it’s a lot of fun, if not super-quick. It is ideal for touring or commuting duties."   |   See the full review


Customer Reviews

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